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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Commit 06a41a9 was also cc'd to stable, so I should make it's way into
the upstream stable kernels.

I built a Utopic test kernel with a cherry-pick of commit 06a41a9.  The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1403459/

Can you test this kernel and see if it fixes this bug.  Note, you will
have to install both the linux-image and linux-image-extra .deb
packages.

Thanks in advance!

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https://bugs.launchpad.net/bugs/1403459

Title:
   kernel bug when hotplugging a CPU

Status in linux package in Ubuntu:
  Confirmed
Status in linux package in Debian:
  Confirmed
Status in linux package in Fedora:
  Unknown
Status in linux package in openSUSE:
  Fix Released

Bug description:
  When I hot-plug a CPU to an Ubuntu 14.10 VM running on KVM, I get
  following kernel bug. Ubuntu 14.04 is not affected by this bug.

  # uname -a
  Linux ubuntu 3.16.0-28-generic #38-Ubuntu SMP Fri Dec 12 17:37:40 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
  # dmesg
  [  109.469094] CPU1 has been hot-added
  [  109.477005] SMP alternatives: switching to SMP code
  [  109.490583] x86: Booting SMP configuration:
  [  109.490586] smpboot: Booting Node 0 Processor 1 APIC 0x1
  [  109.476344] kvm-clock: cpu 1, msr 0:3ffe6041, secondary cpu clock
  [  109.586704] kvm: enabling virtualization on CPU1
  [  109.596330] KVM setup async PF for cpu 1
  [  109.596330] kvm-stealtime: cpu 1, msr 3de2d100
  [  109.596645] microcode: CPU1: patch_level=0x01000065
  [  109.596910] Will online and init hotplugged CPU: 1
  [  109.598469] kobject '(null)' (ffff88003de3b5d8): tried to add an uninitialized object, something is seriously wrong.
  [  109.599255] CPU: 0 PID: 1424 Comm: systemd-udevd Not tainted 3.16.0-28-generic #38-Ubuntu
  [  109.599257] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
  [  109.599259]  ffff880036465250 ffff88003af77c88 ffffffff81781eaa ffff88003de3b5d8
  [  109.599263]  ffff88003af77cf8 ffffffff8139e896 ffff880000000020 ffff88003af77d08
  [  109.599266]  ffff88003af77cb0 ffff88003af77cc8 ffffffff8137967b 0000000000000001
  [  109.599269] Call Trace:
  [  109.599276]  [<ffffffff81781eaa>] dump_stack+0x45/0x56
  [  109.599280]  [<ffffffff8139e896>] kobject_add+0xa6/0xb0
  [  109.599283]  [<ffffffff8137967b>] ? get_first_sibling+0x2b/0x40
  [  109.599287]  [<ffffffff8139d08d>] ? ida_get_new_above+0x1dd/0x210
  [  109.599291]  [<ffffffff81378b66>] blk_mq_register_hctx+0xa6/0xc0
  [  109.599293]  [<ffffffff813794c1>] blk_mq_sysfs_register+0x41/0x60
  [  109.599297]  [<ffffffff81376fc2>] blk_mq_queue_reinit_notify+0x72/0xb0
  [  109.599300]  [<ffffffff8109972d>] notifier_call_chain+0x4d/0x70
  [  109.599303]  [<ffffffff8109983e>] __raw_notifier_call_chain+0xe/0x10
  [  109.599306]  [<ffffffff81070133>] cpu_notify+0x23/0x50
  [  109.599309]  [<ffffffff81070348>] _cpu_up+0x168/0x180
  [  109.599312]  [<ffffffff810703ea>] cpu_up+0x8a/0xb0
  [  109.599315]  [<ffffffff81778ee0>] cpu_subsys_online+0x40/0xa0
  [  109.599319]  [<ffffffff814cf225>] device_online+0x65/0x90
  [  109.599322]  [<ffffffff814cf2cd>] online_store+0x7d/0x90
  [  109.599325]  [<ffffffff814cc658>] dev_attr_store+0x18/0x30
  [  109.599328]  [<ffffffff8125950a>] sysfs_kf_write+0x3a/0x50
  [  109.599331]  [<ffffffff812586ae>] kernfs_fop_write+0xee/0x180
  [  109.599335]  [<ffffffff811e10b7>] vfs_write+0xb7/0x1f0
  [  109.599338]  [<ffffffff811e1c66>] SyS_write+0x46/0xb0
  [  109.599342]  [<ffffffff81789eed>] system_call_fastpath+0x1a/0x1f

  I initially reported this bug in openSUSE and it was fixed in the Linus tree: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=06a41a9
  --- 
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 14.10
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Bochs Bochs
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic root=UUID=6c1dd17e-4ffe-45f6-a99d-6b2530505d72 ro consoleblank=0
  ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-28-generic N/A
   linux-backports-modules-3.16.0-28-generic  N/A
   linux-firmware                             1.138
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  utopic utopic
  Uname: Linux 3.16.0-28-generic x86_64
  UnreportableReason: The report belongs to a package that is not installed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 01/01/2011
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2011:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
  dmi.product.name: Bochs
  dmi.sys.vendor: Bochs

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